question stringlengths 37 38.8k | group_id stringlengths 2 6 | sentence_embeddings listlengths 768 768 |
|---|---|---|
<p>Is it possible to compute the Jensen-Shannon divergence between a discrete and a continuous probability distribution, e.g. between a standard normal distribution and a distribution taking the values 1,2,3 each with probability 1/3? Or are there any other divergences which can be used as a similarity measure of discr... | g59102 | [
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<p>I've trained fitnet network for prediction steel's yield stress with MATLAB <code>ann</code> toolbox. </p>
<p>The neural network should predict yield stress. I have about 250 vector inputs. Every input vector has 12 parameters as inputs plus one parameter as target (yield stress).
<code>ann</code> should predict yi... | g14518 | [
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<p>I'm building a multilevel model with lme4 (two levels: a class and a student level with educational data). I'm using the ICCS 2009 data: <a href="http://www.iea.nl/iccs_2009.html" rel="nofollow">http://www.iea.nl/iccs_2009.html</a>). ICCS 2009 advise the use weights. I made a “within-school student weight” as the pr... | g59103 | [
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<p>I am using stochastic gradient descent for minimizing an objective function of the following form</p>
<p><img src="http://i.stack.imgur.com/b2km3.jpg" alt="enter image description here"></p>
<p>with such an R script</p>
<pre><code>require(rootSolve)
zz <- c(86.02,86.85,87.48,88.69,88.82,87.46,87.4,87.6,
... | g59104 | [
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<p>I am working on a dataset in R that essentially follows 20 groups of individual organisms through time. I am interested in assessing what factors impact their mortality. I have 5 factors that I have measured that I believe effect the final mortality (%) of the individuals in each group. Obviously as time goes on, so... | g59105 | [
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<p>Can someone explain this method of optimized convergence used in CNNs? I understand it involves generating the hessian matrix for every epoch, but can someone outline the steps? Thanks!</p> | g59106 | [
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<p><strong>Background</strong>:</p>
<p>The goal is to measure impact of advertising technique - retargeting. Retargeting is about showing related ads to prospects who add something to shopping cart but abandon it. We would be paying a fixed % of all sales that are made by visitors that are successfully retargeted.</p>... | g59107 | [
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<p>I have a set of data, with outcome and time-varying variables, for patients during the course of their respective stays in the hospital. There is a dichotomous outcome on the last day. The length of stay may be different for each patient. I am most interested in making a predictive model, in the same spirit as one... | g38193 | [
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<p>I am measuring rendering time on Stack Overflow, specifically pre/post changes.</p>
<p>I have data as such</p>
<pre><code>pre_post | RouteName | count | avg | st_dev | min | max
---------+----------------+-------+-----+--------+-----+-----
1. pre | Questions/Show | 24736 | 11 | 15 | 0 | 1004
2. post... | g436 | [
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<p>I would like to use a weighted least squares (WLS) regression to perform tests on heteroscedastic spatial data.</p>
<p>Each data point represents the mean of some variable over an area, and the sample sizes between the areas vary, so intuitively the things I'm measuring are more error prone in areas with a small sa... | g14524 | [
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<p>I am using a linear-log model to test whether overseas development assistance and remittances positively affect FDI in cases of good governance and financial market development. Let's say I want to interact the log of net official development assistance received (ODA) with governance. Governance is estimated as a sc... | g59108 | [
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<p>Suppose the random variable $Y$ has a multivariate normal (MVN) distribution, and consider truncating $Y$ in some way to create $T$. Given $T$'s mean and covariance matrix, I'd like to obtain $Y$'s mean and covariance matrix.</p>
<p>Below I state the above problem more precisely, ask three specific questions, give... | g59109 | [
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<p>Why is Hedonic Regression used (especially in housing prices) instead of Linear Regression?</p>
<p>There do not seem to be any libraries in Python (and R) for Hedonic regression, is it too niched a regression type? Are there regression methods similar to Hedonic regression that I can use instead?</p> | g59110 | [
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<p>I am trying to understand the concept of auto correlation and I am looking for some help to clear some doubts regarding my data.</p>
<p>I have a time series data and it has repeated experiments. Each sample has 4 time points and corresponding values for the genes under study. I have used <code>ind</code> to represe... | g59111 | [
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<p>The courses that I've taken have been primarily in the economics department, but I've been learning more of stats more broadly recently. One thing that I don't understand well is how exactly people account for cluster-wise autocorrelation within mixed-modeling frameworks. </p>
<p>When I talk about cluster-wise au... | g48642 | [
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<p>For my variable $l_t$ I want to use an ARMA(p,q)-GARCH(r,s). So the mean equation follows an ARMA(p,q) and the conditional volatility is modelled by a GARCH(r,s). Is my notation correct?
<img src="http://i.stack.imgur.com/io3dX.png" alt="ag"></p> | g59112 | [
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<p>Sorry if this is a newb question; I'm trying to teach myself statistics for the first time. I think I have the basic procedure down, but I'm struggling to execute it with R.</p>
<p>So, I'm trying to evaluate the significance of regression coefficients in a multiple linear regression of form</p>
<p>$$ \hat y = X \... | g59113 | [
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<p>I am a research student and stuck at a point in my work and want your help. I have three different variables for each node of my network (Energy, Traffic Load and Link quality). These three variables have different units. I want to add them linearly to get a grade or rating in range of (0,1) and assign it to a node.... | g59114 | [
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<p>I understand the rationale that underpins representative sampling (i.e. to avoid bias so that the sample 'broadly' represents the target population). </p>
<p>Suppose the size of the target population is 600 and the population comprises of four types of units as follows:</p>
<ul>
<li>100 white units</li>
<li>250 bl... | g14532 | [
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<p>I have a classification task where I have a number of predictors (one of which is the most informative), and I am using the <a href="https://en.wikipedia.org/wiki/Multivariate_adaptive_regression_splines">MARS</a> model to construct my classifier (I am interested in any simple model, and using glms for illustrative ... | g49886 | [
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<p>My biology test is to measure the rate of photosynthesis in leaf discs. It's a simple experiment where I will infiltrate the leaf disc space with sodium-bicarbonate and cause a pressure difference to sink the leaf disc. Then I will shine a light on it causing photosynthesis and time it in minutes for it to rise to t... | g14534 | [
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<p>In this case I presume loss of ANCOVA power, so I don´t know what type of analysis should I run next. There was significant difference in covariate between groups (p=0,008). Is there some solution? Could you help me please? Can I run ANCOVA if my groups differ on covariate (I know, that I can, but is it right soluti... | g9534 | [
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<p>I have 5 factor scores which were saved out from Mplus6 to SPSS using commands below.</p>
<pre><code>Savedata;
SAVE=fscores;
</code></pre>
<p>I have the variables in SPSS and used them in some analysis but my professor has suggested that I take the 5 factor scores and plot a graph like a half-normal distribution ... | g59115 | [
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<p>When generating samples from a DBN, how do you handle the biases that have been learned for the layers below?</p>
<p>I know that you normally perform a number of Block Gibbs sampling steps in the undirected top 2 layers of the DBN, then propagate the sampled values of the penultimate layer down to the visible layer... | g14537 | [
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<p>There are some variables that I measured but strongly suspect are useless because (for example) almost all my data points scored the same on that (binary) variable.</p>
<p>It's been put to me that I may well leave them in, because in a regularized multiple regression it won't hurt to leave them in, even though it p... | g59116 | [
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<p>Imagine I have a database of 1000 students. I test these students every week with questions that can be true/false. How do I rank the students according to the historical track records?</p>
<p>The problems are: </p>
<ol>
<li>Each student has answered a different number of questions in the past. Many have only answ... | g59117 | [
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<p>I have two 5-point Likert questions x and y. I want to test whether they are associated using the chi-squared test of independence.
I summarized the responses into the following frequency table:</p>
<pre><code> x y
1 3 39
2 7 76
3 38 65
4 97 30
5 75 8
</code></pre>
<p>... | g59118 | [
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<p>I want to obtain the integral:</p>
<p>$$\int_{{\mathbb R}^p} \frac{1}{(2\pi)^{\frac{n}{2}}\vert\Sigma\vert^{\frac{1}{2}}}\exp\left[-\frac{1}{2}({\bf y} - {\bf X}{\beta})^{\top} \Sigma^{-1}({\bf y} - {\bf X}{\beta})\right] d\beta,$$</p>
<p>where ${\bf y}$ is an $n\times 1$ vector, $\beta$ is a $p\times 1$ vector, $... | g59119 | [
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<p>Is there a test I can use to compare two proportions from the same sample that are not mutually exclusive? </p>
<p>For example, I would like see if the proportion of people that answered "yes" to a particular question is significantly different from the proportion of people that answered "yes" to a different quest... | g59120 | [
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<p>I perform some time series fitting with the help of the forecast and urca packages. I have a question regarding the correspondance between results coming from statistical test such as KPSS, ADF or ERS, and the results arising from automatical selection procedures such as auto.arima from the forecast package. </p>
<... | g14540 | [
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<p>I have 3 factors x1, x2, x3, and one outcome y (True, False).</p>
<p>x1 has 3 levels, x2 has 40 levels, x3 has 2 levels.</p>
<p>I would like to find which parameter (x1, x2, or x3) and associated levels influence the most the outcome y.
Is this possible with rpart?</p>
<p>I tried:</p>
<pre><code>fit <- rpart(... | g14541 | [
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0.0011586099863052368,
-0.009689015336334705,
-0.002821504371240735,
0.012133556418120861,
0... |
<p>I've tried to sample by analyzing single step of the "dreaming" but the output seems nonsensical. There are some patterns but they don't really look like the data the RBM was shown ( for example, simple lines on a black and white 10x10 matrix of pixels ). This is what it dreamt when I've trained it on pictures of ci... | g14542 | [
-0.051248837262392044,
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0... |
<h1>Problem</h1>
<p>My problem is to profile the individual user (i.e. mine individual user's interest, location, and many more).</p>
<p>What we have as input are the <strong>network structure</strong> (e.g. linked-in network) including user set $V$ and link set $E$ and the <strong>attributes</strong> for each user (... | g14543 | [
-0.024889016523957253,
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0.0021532492246478796,
0.003449601586908102,
0.024547239765524864,
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0.015317627228796482,
0.013627280481159687,
0.04301360249519348,
0.019367117434740067,
0.007561980746686459,
0.004087707493454218,
-0.011099324561655521,
... |
<p>I have two experimental conditions, each with 20 reps (40 experiments total). In all 40 experiments a non-fixed number of sounds were recorded, and I've measured each of their durations. I would now like to test the null hypothesis that, on average, the sound durations in condition A are the same as in condition B. ... | g59121 | [
0.0534554161131382,
-0.02367769181728363,
-0.010233393870294094,
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0.0002388304565101862,
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0.017214037477970123,
0.001091876532882452,
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-0.005000867415219545,
0.022887878119945526,
0.002926101442426443,
0.00005986966425552964,
... |
<p>Ideally, I would input a one-dimensional array of data, and output the estimates for the three parameters. I'm not very familiar with any statistics software but I have MATLAB (and all of the free software available, I suppose).</p> | g14546 | [
0.00025932342396117747,
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0.02099376544356346,
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0.0017648248467594385,
0.009433385916054249,
... |
<p>I'm comparing the ratio of two measured variables as either 1:x or x:1, depending on which is higher. Absolute difference isn't so important, rather the proportion, that's why I'm trying this method.</p>
<p>On the plot's y axis, I don't want any decimal numbers below 1 (being 1:1). Instead, I would like marks on y ... | g59122 | [
0.035650819540023804,
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0.04175792634487152,
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0.05929721146821976,
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0.02273758314549923,
-0.0... |
<p>I have a dependent variable (my 'label' in RapidMiner terms), that is a binary classification expressed as 'WIN' or 'NOTWIN'.</p>
<p>I know 'NOTWIN' is exhibited in about 90% of all observations.</p>
<p>When I try to run a K Nearest Neighbors approach, the generated results do not show a confidence percentage. I ... | g43658 | [
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0.070598304271698,
0.048437077552080154,
0.0449250191450119,
0.0... |
<p>Given a set $P_i$ of probabilities and a Cumulative Distribution Function of $X$ you can find the set $X_i$ of values of $X$ corresponding to $P_i$. The $X_i$ are the "quantiles". Is there an equivalent generic term for referring to the $P_i$ corresponding to a given set of $X_i$?</p>
<p>You could refer to them as ... | g59123 | [
0.028145484626293182,
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<p>Suppose that we want to generate a draw from the following distribution:</p>
<p>$P(X=0) = 0.5$</p>
<p>$P(X=1) = 0.5$</p>
<p>There are two constraints though:</p>
<p>(a) The draw has to be on the basis of an external event.</p>
<p>(b) Related to (a), the draw must be verifiable by a third party. In other words, ... | g59124 | [
0.019867179915308952,
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<p>I am working with Markov models with ordinal, non-normal distributions of probabilities. Ultimately, I would like to create a metric for determining the probability of a specific path occurring. At any given point along the path, there is a range of possible moves with associated probabilities. However, these a... | g14548 | [
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<p>This is dataset that is going to be data mined for factors that affect an output that of interest</p>
<p>A large Part of my dataset (150 of 300 potential inputs) has a heavy skew of Zero values. usually this is >90% and always >70% zeros (true zeros)</p>
<p>This has risen as the input variables are usually OR opti... | g59125 | [
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... |
<p>I keep running into these nice pictures:</p>
<p><img src="http://i.stack.imgur.com/fYIoK.png" alt="enter image description here"></p>
<p>But I have no idea what they are called!</p> | g49546 | [
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-0.... |
<p>In this PDF <a href="http://people.csail.mit.edu/yks/documents/classes/mlbook/pdf/chapter2.pdf" rel="nofollow">http://people.csail.mit.edu/yks/documents/classes/mlbook/pdf/chapter2.pdf</a> page 5 says:</p>
<p>Given a set of functions $f(x_i,pa(x_i))$ non-negative and sum to 1, we define a joint probability as follo... | g59126 | [
0.021841850131750107,
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0.06189626082777977,
... |
<p>Suppose we have iid observation with the following model $ Y_t \sim \mathcal{N}(\mu,1/\mu) , t=1,2,..T$</p>
<p>The question is " Assuming a flat prior on $(0 ,\infty )$ find a 95% HPD interval for $\mu"$</p>
<p>The aditional information that the problem gives is: $T=6; \sum{y_i}^{2}=76;\sum{y_i}=18$</p>
<hr>
<p>... | g59127 | [
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<p>Given a numeric dataset $\{(x_i, y_i, z_i)\}_{i = 1}^N$, one can create a scatterplot by drawing a point $P_i = (x_i, y_i)$ for each $i = 1, \dots N$ and color each point with an intensity depending on the value of $z_i$.</p>
<p>Assume I have created this scatterplot. What I would like to do is to divide the plane ... | g14554 | [
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0.06605330109596252,
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<p>I am measuring accumulation of a fluorescent-tagged protein at a particular location within a cell over time. In previous experiments that I have performed, I see a standard exponential distribution where the fluorescence intensity reaches a plateau, however in my current experiment, I see a distribution as shown be... | g14555 | [
0.007976064458489418,
0.00011331221321597695,
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0.019929587841033936,
0.03672495856881142,
0.0830413773655891... |
<p>Okay, so I'm going to admit right away that I'm very new to statistical analysis, so please go easy on me.</p>
<p>I have a 50+ different groups of people and for each group, I have the number of people using a product, and the total number of people in the sample. So, for group number 1 of 50+, 353 out of 26719 us... | g14556 | [
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0.03843824192881584,
0.031506508588790894,... |
<p>Suppose I build a OVA classification model for classification with more than 2 possible classes (a model of sub-models, where each submodel predicts the probability of a data point belonging in a single class).</p>
<p>Occasionally, one or more of the submodels might not perform very well. For instance, the model fo... | g14557 | [
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... |
<p>Below are first few rows of my data that need to be analysed. I would need to understand the relation between number of years and survival rate. My statistical teacher advised on using rma.glmm() function in R language to do poission regression. However I find glmm() is being used only for two group of variables and... | g59128 | [
0.013093430548906326,
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0.020530888810753822,
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0.008302673697471619,
0.02927122265100479,
0.016263248398900032,
0.004781397525221109,
0.00... |
<p>In the example from the web site I was trying out <a href="http://www.cimt.plymouth.ac.uk/projects/mepres/alevel/fstats_ch5.pdf" rel="nofollow">this problem</a>
in <strong>page 107</strong> about Goodness of fit test for a normal distribution.Question is about analysis of fat content of hamburgers.</p>
<p>I under... | g59129 | [
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0.0007704174495302141,
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... |
<p>In the Stan user's manual (<a href="https://github.com/stan-dev/stan/releases/download/v2.0.1/stan-reference-2.0.1.pdf" rel="nofollow">Version 2.0.1</a>, page 157), it says</p>
<blockquote>
<p>A hierarchical model such as the above will suffer from the same kind of inefficiencies... [for a Hamiltonian Monte Carlo... | g59130 | [
0.05910962074995041,
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0.05373680964112282,
-0.013883464969694614,
0.... |
<p>My question is "What could you do if you wanted to reduce the error term (e)? I know the error term is basically the distance between the line and the point but I don't know how you would reduce it. </p>
<p>The problem is:</p>
<blockquote>
<p>The Postal Service is attempting to reduce the number of complaints ... | g59131 | [
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0.05075237900018692,
0.03073727712035179,
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<p>I'm trying my hand at resampling techniques with a dataset I have, and I think either I'm missing a conceptual point with bootstrapping, or I'm doing something incorrectly in <code>R</code>. Basically, I'm trying to use it in a correlation/regression framework, and I'm able to get the original coefficients, the boot... | g59132 | [
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0.016068110242486,
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0.04805784672498703,
0.026... |
<p>I was wondering, in relation to model selection for some count data I am looking at using poisson GLMs, would a high residual deviance (measure of dispersion) warrant switching to a quasi-poisson model before or after dropping unimportant explanatory variables?</p> | g59133 | [
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... |
<p>I'm interested in how many samples are required to see a relationship between allele frequencies (proportions of alleles) and environmental gradients, such as temperatures and water quality. Environmental gradients are either continuous or categorised into 5-9 levels. I understand that we can use pwr.2p.test(h = , n... | g59134 | [
-0.0009702552342787385,
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... |
<p>I am carrying out a zero-inflated negative binomial GLM on some insect count data in R. My problem is how to get R to read my species data as one stacked column so as to preserve the zero inflation. If I subtotal and import it into R as a single row titled Abundance, I loose the zeros and the model doesn't work. Alr... | g43683 | [
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-0.011318613775074482,
0.02483682706952095,
0.005159769207239151,
0.02809455618262291,
-... |
<p>I have a data set which is a set of continuous distances from some origin. I originally modeled this as a negative binomial distribution by rounding the data and using it as an input in the Matlab function, <a href="http://www.mathworks.com/help/toolbox/stats/nbinfit.html" rel="nofollow">nbinfit</a>:</p>
<pre><code... | g59135 | [
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<p>Let's say you have a response variable and an independent variable. Your data is measured across several levels of a categorical independent variable. One approach in analysing these data would be to use linear regression to estimate a slope at each level of the categorical independent variable. This is the approach... | g14564 | [
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0.0005560764111578465,
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<p>Ensemble methodology's main aim is to somehow aggregate or summarize estimates from multiple models. In some cases this is aggregating different bootstrap estimates or Monte Carlo estimates, but others involve combining the estimates from starkly different models. When you look up "ensemble methods", especially in E... | g59136 | [
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0.08157313615083694,
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0... |
<p>I'm working on samples that I'm trying to fit into log-normal distributions. In some cases, Kolmogorov-Smirnov test statistics is something like D = 0.0056 with an associated p-value of 0. Hence, my sample shows very small departures from a theoretical log-normal distribution, but looking at the p-value I reject the... | g59137 | [
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<p>I conducted an experiment, testing three conditions with 27 participants in a repeated measures design. Since the data is not normally distributed I used a Friedman test that reported a p-value of 0.1, a slight disappointment given how much time I spent in the lab. Being disappointed but curious, I still performed W... | g59138 | [
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<p>My maths knowledge is pretty poor but I'm looking to improve on a new project I'm interested in.</p>
<p>I have data from thousands of MMA fights/fighters including weights, height, reach etc. and I'm trying to make a calculation to predict future fights.</p>
<p>Now I know this is probably a huge task, but I'm thin... | g59139 | [
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0.03503189608454704,
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-0.036799509078264236,
0.007496930658817291,
0.024436213076114655,
-0.09721283614635468,
-0.04929235577583313,
-0.007482966408133507,
-0.03449944034218788,
0.099986732006073,
-0.022... |
<p>Given a transition matrix, starting probability, means and covariances</p>
<p>Is it possible to predict the most likely observed sequence for a given state sequence using the above details? If yes, how? </p>
<p>Thanks in advance. </p> | g59140 | [
-0.03308558464050293,
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-0.020504826679825783,
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-0.0037382105365395546,
0.038012515753507614... |
<p>I would like to run an analysis of variance (parametric or not) with two factors; each factor having two levels. So if x, y is are the levels of the first factor and 1, 2 the levels of the second I would like to calculate whether the difference x1-x2 is significantly different to the difference y1-y2 (with $n_{x1} \... | g59141 | [
-0.0312885046005249,
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0.016316281631588936,
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-0.0007595150382257998,
-0.05757801607251167,
0.04461083933711052,
0.04429123178124428,
-... |
<p>I have a data set of continuous proportions which depend on a fixed-effect factor, e.g.:</p>
<pre><code>df <- data.frame(
x = c(0.1,0.2,0.12,0.3,0.2,0.35,0.5,0.3,0.45,0.6,0.54,0.77),
f = as.factor(c(rep("A", 6), rep("B", 6)))
)
</code></pre>
<p>I'm looking for a method to remove the effect of the factor, ... | g59142 | [
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0.006179564166814089,
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<p>I need to classify large numbers of short answer, free response data from a study with a between-group design.</p>
<p>In order to reduce the amount of manual labor costs, I was thinking of manually coding a small sample set, running the rest of the responses through an SVM classifier, and then coding a random sampl... | g59143 | [
-0.017813578248023987,
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0.02... |
<p>How to obtain a variable (attribute) importance using SVM? </p> | g13359 | [
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0.0... |
<p>This is somewhat related to <a href="http://stats.stackexchange.com/questions/12281/fast-computation-estimation-of-a-low-rank-linear-system">this question</a>.</p>
<p>I have two full rank matrices $A_1,A_2$ each
of dimension $p \times p$ and a p vector $y$.</p>
<p>These matrices are closely related in the sense t... | g14570 | [
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0.015846019610762596,
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0.07728899270296097,
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0.01333... |
<p>I use matlab a lot to fit functions to datasets. I then need to determine some kind of error estimate on the fitted parameters. </p>
<p>Say I have a dataset of $N$ points which is given by the points $(x_i,y_i),\ i=1,\ldots,N$. I need to fit a function $f(x,P)$ where $P$ is the parameter matrix</p>
<p>$$P = \left[... | g43697 | [
0.048937954008579254,
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0.0018751006573438644,
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0.008073249831795692,
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0.051598645746707916,
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0.028648318722844124,
0.019326113164424896... |
<p>I have started my PhD in statistics this year, and I am looking for your best-practices, advice and (meta-advises) regarding how to grow and become a good academic researcher in the fields of statistics/ML.</p>
<p>General thoughts and links are welcomed, but in order to start the ball rolling, here are a bunch of q... | g37860 | [
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0.03824348375201225,
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0.09439518302679062,
... |
<p>I have a large number of projects (about 300). Each project contains a set of test cases. Each test case can result in a success or a failure. The dataset looks like this. </p>
<p>Original:</p>
<pre><code>project, passed, total, time, score
p1, 121, 210, 13, (121/210)
p2, 100, 120, 14, (100... | g27138 | [
0.027328310534358025,
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0.027985623106360435,
0.05675908178091049,
... |
<p>I am testing a hypothesis that states that participants after an intervention will be more likely to perceive themselves as being at risk for disease. Two questionnaires will be used. One will consist of 5 questions and will measure perceived susceptibility and the the other will consist of 7 questions and will mea... | g43698 | [
0.010819689370691776,
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0.006684033665806055,
0.08391481637954712,
0.03361179679632187,
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0.... |
<p>I'm writing a set of unit test for a function that draws random numbers from an arbitrary distribution, defined as a PDF (example of such a function can be seen <a href="http://code.activestate.com/recipes/576556/" rel="nofollow">here</a>). I am confused about the proper way of obtaining a good confidence that the f... | g59144 | [
0.036356113851070404,
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0.03073847107589245,
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0.029982661828398705,
-0.... |
<p>I am running 9 regressions with 5 predictors each. The dependent variables are ordered, but have been treated before as count (and have a Gaussian distribution). </p>
<p>I ran the 9 regressions using the MASS package, using both
1) glm with family=gaussian, and
2) polr </p>
<p>The estimates of the models are very ... | g14573 | [
0.018902556970715523,
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0.011892161332070827,
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0.010484803467988968,
0.006636959966272116,
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0.009764729999005795,
0.010409201495349407,
-... |
<p>Netflix and Google among others use customer usage (number of videos streamed or unique searches conducted) as a proxy for value, or for determining which version of a test is best. I am curious how they would measure this but I'm not great at statistics.</p>
<p>If they split their customer base into even groups, t... | g30971 | [
-0.06214610114693642,
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0.00746014341711998,
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0.013039025478065014,
-0.0251160841435194,
0.01869872957468033,
0.047... |
<blockquote>
<p><strong>Possible Duplicate:</strong><br>
<a href="http://stats.stackexchange.com/questions/6047/does-this-quantity-related-to-independence-have-a-name">Does this quantity related to independence have a name?</a> </p>
</blockquote>
<p>Is there a term for the joint probability of two events $A$ an... | g49547 | [
0.04918971657752991,
0.0324706993997097,
0.02479976788163185,
0.030927127227187157,
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0.017328409478068352,
0.0349532812833786,
0.014357486739754677,
-0.00378574151545763,
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0.00167774164583534,
0.01851266622543335,
-0.01221021... |
<p>I would like to create a composite scale using items that measure parent communication extracted from a UK panel survey (n=941). However although all 6 variables in question measure similar constructs - 2 of the items are dichotomous (yes/no) the other 4 are likert (1,2,3,4). My intention is to transform the 6 varia... | g49864 | [
-0.01827845349907875,
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0.008418979123234749,
0.005670994054526091,
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0.020339971408247948,
... |
<p>I am working on a algorithm for a software module but decided I was hung up on the mathematical formula so I posted here instead of Programmers.</p>
<p>Each scenario will have a team of people competing. Each team can be thought as a unique set of players each of random variable size. Minimum team size is 2.</p>
... | g48967 | [
0.022149978205561638,
0.022332413122057915,
0.003787347814068198,
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0.027311967685818672,
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0.026330336928367615,
0.02819804847240448,
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0.050538431853055954,
0.004710171837359667,
0.05204324424266815,
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0.03... |
<p>These are the values:</p>
<pre><code>18.2 17.6
------------------------------------------------------------------------------------------------------------
18.9 18.6
------------------------------------------------... | g14576 | [
0.001155547914095223,
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0.05637543275952339,
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0.06516338139772415,
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-0... |
<p>Isn't this test for the determination of auto-correlation of residuals only necessary when time is some sort of a factor in the observed variables?</p>
<p>As it is I had a data-set that had one dependent variable (sales) and three independent variables, (unemployment rate, population size and advertizing expense). ... | g41550 | [
0.03704260289669037,
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0.08444450795650482,
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-0.02658931165933609,
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0.0527535006403923,
0.007542798761278391,
... |
<p>I have an experiment where several subjects (subjects $= S_1,S_2,...,S_m $) were asked to perform a set of tasks (tasks $= T_1, T_2, T_3,...,T_n$) using both their left ($L$) and right ($R$) arms. Each task for each arm was repeated $r$ times. The response is measured in a variable called 'measure'. Unfortunately, t... | g59145 | [
-0.05197634920477867,
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0.013029765337705612,
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0.06374205648899078,
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0.019985854625701904,
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0.005222749896347523,
0.032589588314294815,
0.... |
<p>I have a summer research project that I'm currently working on that involves face recognition
during a video capture session. I currently have an algorithm that returns a ranking of the closest
matching results along with a similarity measurement that indicates how closely the input face image
was matched. These si... | g59146 | [
-0.006191929802298546,
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0.03248615562915802,
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0.03978083282709122,
0.01221459824591875,
-0.007870364002883434,
0.048592835664749146,
0.02... |
<p>I am trying to fit a Bayes glm model with an inverse Gaussian family and <code>link="identity"</code>. However, I'm getting the following messsage: </p>
<pre><code>Error in if (iter > 1 & abs(state$dev - devold)/(0.1 + abs(state$dev)) < :
missing value where TRUE/FALSE needed
</code></pre>
<p>My code... | g46 | [
0.003919161856174469,
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0.008067294023931026,
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0.007035704795271158,
0.02889242395758629,
0.039220646023750305,
-0.... |
<p>When solving business problems using data, it's common that at least one key assumption that under-pins classical statistics is invalid. Most of the time, no one bothers to check those assumptions so you never actually know. </p>
<p>For instance, that so many of the common web metrics are "long-tailed" (relative to... | g59147 | [
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0.012602269649505615,
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0.05687529966235161,
-0.... |
<p>I have percentile data (P10, P25, P75 and P90) for a variable.<br>
I also have the mean and median for each group:</p>
<pre><code>group mean median P10 P25 P75 P90
1 30100 26200 19900 22500 32800 44200
2 38700 36600 28000 31500 44000 52100
</code></pre>
<p><strong>... | g59148 | [
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0.013157554902136326,
0.05084335058927536,
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-0.03353297710418701,
-0.003246747888624668,
0.013692242093384266,
0.06135321408510208,
-0.... |
<p>First, let's assume that we want to generated from a <a href="http://en.wikipedia.org/wiki/Dirichlet_distribution" rel="nofollow">Dirichlet</a>(1,1,1,1) distribution. Would the following method be correct?:</p>
<ul>
<li>generate three variates from a Uniform(0,1). Call them $x_1$, $x_2$, $x_3$.</li>
<li>then, order... | g46024 | [
-0.007877164520323277,
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0.008883411064743996,
-0.017786143347620964,
0.0331322774291038... |
<p>I am working on a determining why certain employees cause errors in a company's process and why others do not. I have the employee information, information about the errors they have made and the teams that the employees are in. </p>
<p>All the employees in all the teams have caused errors at one point or another. ... | g14583 | [
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0.06570339947938919,
0.... |
<p>I am trying to do a "round trip" to verify that my code works with regards to recovering parameters of normal distributions.</p>
<p>I'm using this document regarding the normal-gamma distribution:
<a href="http://www.cs.ubc.ca/~murphyk/Teaching/CS340-Fall07/reading/NG.pdf" rel="nofollow">http://www.cs.ubc.ca/~murph... | g59149 | [
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<p>One question I have carried around with me for a while is related to including quadratic terms for model specifications. I wonder why it is considered ok to include linear and quadratic terms into OLS analysis, despite the fact that the Variance Inflation Factor (VIF) gets high. A model specification that I was taug... | g59150 | [
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0.03917791694402695,
0.049763284623622894,
-0.... |
<p>I'm sure this is a simple problem, but I'm not sure how to search and find the answer.</p>
<p>I have a set of parameters that I've estimated using 'fitdist':</p>
<pre><code>Fitting of the distribution ' gamma ' by matching moments
Parameters:
estimate
shape 0.2018062
rate 3.1255336
</code></pre>
<p>now I... | g59151 | [
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<p>I'm looking to check my logic here. </p>
<p>Say you measure a quantity in group A, and find the mean is 2 and your 95% confidence interval ranges from 1 to 3. Then you measure the same quantity in group B and find a mean of 4 with a 95% confidence interval that ranges from 3.5 to 4.5. Assuming that A & B are in... | g59152 | [
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-... |
<p>My outcome is an ordinal variable having 4 levels. I did an ordinal regression and get one universal beta-coefficient describing each level change.</p>
<p>If I do 3 logistic regressions on each level change, I would have an alpha-error of 3 * 5% (multiple testing)</p>
<p>My question: Is there such a cumulation of ... | g14584 | [
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0.024851420894265175,
-0.... |
<p>I begin with a matrix of features (~30000 rows) vs cases (columns). I have binary - TRUE or FALSE - data in each cell indicating whether there is an event spanning the feature for that case. Next, I sum each row to get the total number of cases from the sample set that have an event for each feature. I will call thi... | g59153 | [
0.04189208522439003,
-0.022870048880577087,
0.006147878710180521,
0.007352827116847038,
0.02476985938847065,
-0.014212960377335548,
0.03039018251001835,
0.041026417165994644,
-0.027365095913410187,
-0.024476297199726105,
-0.006011838559061289,
0.030243122950196266,
0.05173109844326973,
0.0... |
<p>I used R <a href="http://cran.r-project.org/web/packages/mvpart/index.html" rel="nofollow">mvpart</a> package to create a multivariate regression tree. This is part of the output:</p>
<pre><code> CP nsplit rel error xerror xstd
1 0.02717093 0 1.0000000 1.00... | g59154 | [
-0.013548220507800579,
-0.07765395194292068,
-0.03341379389166832,
-0.03252263739705086,
0.044151417911052704,
-0.055917028337717056,
0.03892207518219948,
-0.011566627770662308,
-0.01828795298933983,
-0.0007162721594795585,
-0.04028734937310219,
0.008236432448029518,
0.09639796614646912,
0... |
<blockquote>
<p><strong>Possible Duplicate:</strong><br>
<a href="http://stats.stackexchange.com/questions/27554/logistic-regression-sub-group-size-parameters">Logistic regression sub-group size parameters</a> </p>
</blockquote>
<p>Someone in my lab has a sample of 500 older kids and he wants to investigate wha... | g49548 | [
-0.0385282002389431,
0.013562778010964394,
-0.005829980596899986,
-0.04551062360405922,
0.028482235968112946,
-0.006147942040115595,
0.06964880973100662,
-0.0018403643043711782,
-0.05061684921383858,
-0.033092208206653595,
0.022025564685463905,
0.025981511920690536,
0.016897685825824738,
0... |
<p>Does normalizing data (to have zero mean and unity standard deviation) prior to performing a repeated k-fold cross-validation have any negative conquences such as overfitting?</p>
<p>Note: this is for a situation where #cases > total #features</p>
<p>I am transforming some of my data using a log transform, then no... | g59155 | [
0.015106448903679848,
-0.003128970740363002,
0.029466349631547928,
-0.020693397149443626,
-0.02496751770377159,
-0.007512337528169155,
0.06423989683389664,
0.028728891164064407,
-0.04261681064963341,
0.012833850458264351,
0.0022675455547869205,
0.005255226511508226,
-0.03711416944861412,
-... |
<p>I have data from a study with three conditions. The independent variable was within-subjects and within-items.</p>
<p>I did an F1 and F2 analysis (= twice a repeated measures ANOVA) on the averages, by subject (the participants) and by item (the words). I checked/corrected for sphericity and the means do differ sig... | g59156 | [
-0.016406137496232986,
-0.018501723185181618,
-0.023501383140683174,
-0.03568930923938751,
0.0014420124934986234,
-0.041904937475919724,
-0.007461254484951496,
-0.022056404501199722,
-0.05299742892384529,
-0.02022600919008255,
-0.016115738078951836,
-0.015473747625946999,
0.00789725128561258... |
<p>I have a signal, of varying amplitude, and after a certain point in time, I expect to see the period of this signal lengthen. I am looking for a way to measure the lengthening of this period.</p>
<p>Is this a way I can calculate the instantaneous period of the signal below, at any given point? For example, at index... | g14586 | [
0.01898965798318386,
-0.022430241107940674,
-0.014672833494842052,
-0.07594319432973862,
0.0029940109234303236,
-0.06322170048952103,
0.005504744593054056,
0.02054739184677601,
-0.029093585908412933,
0.025732558220624924,
-0.058337558060884476,
0.08567967265844345,
0.0337585024535656,
0.03... |
<p>I'm working with data from different accelerometer hardware. Each hardware has a different maximum range, different resolution at which data changes, and different minimum delay after which a new value is emitted. For example for one hardware, the maximum value it can obtain is 10240, emitted after a minimum of 1000... | g14588 | [
0.0808146521449089,
-0.0088258758187294,
0.004289694130420685,
0.05716842785477638,
0.0316956602036953,
-0.015516802668571472,
-0.05643611028790474,
-0.008225849829614162,
-0.03495597094297409,
-0.02557452581822872,
-0.009430167265236378,
0.05434490367770195,
0.02716737985610962,
0.0154860... |
<p>Consider two samples in AB testing with different structure. </p>
<p>For example for sample 1 we have:</p>
<ul>
<li>city1 - 55%</li>
<li>city2 - 45%</li>
</ul>
<p>(55% of website visitors, who see design1, are from city1)</p>
<p>For sample 2 we have:</p>
<ul>
<li>city1 - 47%</li>
<li>city2 - 53%</li>
</ul>
<p>... | g59157 | [
0.023415355011820793,
0.02289162017405033,
-0.014376956038177013,
-0.040674902498722076,
0.0058025773614645,
-0.07349596172571182,
-0.03015756420791149,
-0.0063506001606583595,
0.012236318551003933,
0.0044912961311638355,
0.05269666761159897,
0.016071423888206482,
0.05496877804398537,
-0.0... |
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